Iran plans to stay in the deal, as do the other P4+1 nations. This involves substantial sanction relief for Iran and allowing Western businesses to trade with Iran. Though the US never really complied with this, European nations have tried to allow such deals, and don’t want the US to stop them.

These early signs point to the Trump Administration expecting everything to go back to pre-2015 Iran deal levels, with Iran under an effective global trade ban. No one else seems interested in doing that. Since the US made this decision unilaterally, over the objection of all other signatories, many are likely to resist the US demands.